Electricity

What you'll learn

A concept-first Class 10 guide to electricity: electric current and potential difference, Ohm's law, resistance, series and parallel combinations, and the heating and power formulas with worked examples.

This chapter has

Electricity — solved practice questions

6 Class 10 Science questions with step-by-step solutions. Attempt each, then reveal the answer.

1. Q1easy

   The SI unit of electric current is the:

   • Avolt
   • Bampere
   • Cohm
   • Dwatt
   Show answer & solution

   Correct answer: (B) ampere

   Electric current is measured in amperes (A).

2. Q2medium

   Ohm's law is expressed as:

   • AV = IR
   • BV = I/R
   • CV = R/I
   • DV = I + R
   Show answer & solution

   Correct answer: (A) V = IR

   Ohm's law: V = I × R (voltage = current × resistance).

3. Q3easy

   The SI unit of electrical resistance is the:

   • Aampere
   • Bvolt
   • Cohm
   • Dwatt
   Show answer & solution

   Correct answer: (C) ohm

   Resistance is measured in ohms (Ω).

4. Q4easy

   The SI unit of potential difference (voltage) is the:

   • Aampere
   • Bvolt
   • Cohm
   • Dcoulomb
   Show answer & solution

   Correct answer: (B) volt

   Potential difference is measured in volts (V).

5. Q5medium

   Electric power is given by the formula:

   • AP = VI
   • BP = V/I
   • CP = I/V
   • DP = V + I
   Show answer & solution

   Correct answer: (A) P = VI

   Power P = V × I (voltage × current).

6. Q6medium

   In a series circuit, the current through each component is:

   • Athe same
   • Bdifferent
   • Czero
   • Ddoubled
   Show answer & solution

   Correct answer: (A) the same

   In a series circuit the same current flows through every component.

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